Saddle for the tables of thread-stitching machines



Sept. 11, 1928. 1,684,342

u. BiscHoF SADDLE FOR TABLE; OF THREAD STITCHING MACHINES failed Max:117, 1925 5 Sheets-Sheet l Sept. 11, 1928.,

U. BISCHOF YSADDLELFOHR THE TABLES 0F THREAD swmcHINa Mmas-s.

Filed March '1, 192 5 5 Sheets-811g 2 Sept. 11, 1928. 1,684,342

u. BISCHOF v I SADDLE FQR THE TABLES OF THREAD STITCHING MACHINES Filed March 7, 1925 5 She'ebsiwez 3 Sept. 11, 1928. 1,684,362

' U. BISCHOF v SADDLE FOR THE TABLES 0F THREAD STITCHING MACHINES Filed March 7. 1925 5- Sheets-Sheet 4 u 1 \J ,I/

Z],- \Zb SQLZLaf w Sept. 11, 1928.

1 r U. BISCHOF SADDLE FOR THE TABLES 0F THREAD STITCHING MACHINES Filed March 1925 5 Sheets-Sheet 5 r-rmrfi m ULrichBzschof Patented Sept. 11, 1928.

UNITED STATES PEA Tsar E.

ULRIGI-I BISCHOF, OF HORGEN, SWITZERLAND, ASSIGNO-R, BY ASSIGNMENTS,

TO SMYTH MANUFACTURING COMPANY, OF- HARTFORD, GONNEGCLIGUT, A1 CORPORA- TION OF CONNECTICUT.

SADDLE m. THE TABLES or zrnnnAn-srmonrne ivmonrnns Application filed March 7,1925, SeriafNo. 13,809, and in'SwitzerIand November'20, "1924.

The saddles for the tables oftln'ead-stitch ing machines for supporting the sheets have an obtuse angle of about 70. This has the great disadvantage that the sheets before be- 8 ing laid on the saddle always have'to be-i'orcibly pulled apart by hand, in order that they shall rest properly onthe saddle and will not be turned over at the told, when the sheets are brought under t-hestitching rail and the nee- 10 dles for being stitched. This opening and laying on of the sheets requires a considerable amount of practice on the part of the worker, if the full number of revolutions of the machine are to be utilized. A further disadvantags of the blunt saddle is, that the preliminary puncturing needles and the sewing and hooked needles must pass through the sheets at an inclination of about 35, whereby the sheets are easily forced backwards in'the machine by the preliminary puncturing needles and consequently the holes will not be in'the middle of the fold and the sewing and hooked needles tend to be bent, owing to this inclined position when passing through the sheets, and

thus easily break.

Another saddle for the table of a threadstitching machine has the form; of an arm and consists of two parallel plates screwed together, the preliminary puncturing needles being guided-between the said plates and having at the top semicircular grooves 'tor'the reception of the sewing needles. This saddle has the disadvantage that the thread laying means used successfully in all other stitching machines for taking up the thread from the sewing needle and transferring it to the hooked needle cannot be fixed and that therefore semicircular sewing needles must be used. These needles have however the great disadvantage that they break very easily, all the more since the needles for making thepreliminary punctures are made very thin and are only operated from one side, so that more particularly the thicker sheets are insrifliciently punctured beforehand, which causes still more needle breakages.

The subject of the present invention isa sharp ridged table saddlewith a plate, the place of entry of which for the needles forms an angle of approximately 35 and is provided with an inclined surface, on which the stitching thread slides upwards. When such a sharp ridged table saddle is used, the sheets need notbe opened out before being laid on,

which considerablyincreasesthe output or" the worker. ."Owingv to'the sharp ridged sa'ddle the preliminary puncturing needles and the sewing andhooked needles can be .arranged s0 as'to'be at least approximately vertical, which on'the one hand oompletelyprevents the sheets being displaced when they are being punctured and on the other hand makes itpossible to use straight sewing and hooked needles. 'Itisalso"imposisble'for the sheets to be displaced v laterally, when the needles enter the holes, and for the needlestofbe broken. A further advantage of the sharp ridged tablesaddle consistsin thisthat the pivotal axis ofthe table saddle is placed above the saddle so 'that the saddle, when swinging outwards, also swings upwards and during the subsequent inward swing strips the same time acts as a stripper. This obviates the necessity of providing: a separate stripper and the inachine is made less complicatedand cheaper.

Figs. 1 an'd2 are a'front and side view of the same as applied'to a'thread-stitcliing machine,

stitched sheets downwards andthusatithe v The u i f'the invention isshown in the accompanying drawings i Whih.

Figs."3;.and show the saddle acting'as a ddleinfront and shown in the drawing as "tormingpart' of a thread-stitching machine, whichworks with a pair of needles havinga vertically upward anddownward motion and consisting of a sewing needl'ell and a1, hooked needle-12. By this pain ofneedles' the sheetsare only stitched in-oneplace; two or more pairs-of needles may, however, be" provided according to the length ot'the sheets to bestitched. Themachinehas'two lateral frames l. and 2, in which thehorizontal shaft 3lais'journalled. On. the

v shaft?) are fixed the'cain discs'tandtl In the frames a bar 10 is guided so as to be capable of sliding upwards and downwards, which bar carries the needles 11 and 12 and the rollers13 and 1 1-, which engage with the cams.

A the arms 22 and 23 supporting at the bottom the transverse member 26 of the table, each of the arms being provided with a roller 24 and 25 respectively. The roller 24 engages with the cam 6 of the left-hand disc 4 and the roller 25 with the cam 6 of the righthand disc 5. In the transverse member 26 of the table a rail 27 is guided so as to be capable of an upward and downward motion. The rail 27 has rollers 28 and29, oneat either end, which rollers engage with the cams 8 of the discs l and 5, and preliminary puncturing needles 30. In the transverse member 26 is also journalled a bar 31 provided with a roller 33 and supporting the thread laying member 32,

l which bar is drawn by a tension spring 3a against the cam disc 5 and is moved to and fro in the lateral direction by a cam 35 screwed Y to the said disc.

The transverse member 26 of the table has a plate 36 the top of which is formed in its as to be capable of an upward and downward motion and has rollers 39 andtO at the lefthandand right-hand ends, which engage with the corresponding cams 9 of the discs 4.- and 5, and supports the thread gripping pin 41 and i a bar 42. The bar 42 has guide rollers 43 and 44 at the left-hand and right-hand ends, which bear against the cams 4:5 and 46 screwed on the cam discs'5 and 4, the cam45 displacing it to the left and the cam 46. to the 7 right, whereby the thread gripping pin is caused to be opened and closed by an inclinedsurface 47 on the bar 42.

"The saddle described above operates as follows:

The sheet 48 which is to be stitched (Figs. 1 and 2) is laid on the saddle 36 which is swung out to the left (Fig; 3) and, on the cam discs 4 and 5 being turned in the direction a indicatedby the arrow P (Fig. 2 the saddle together with the sheet is brought by the cams 6 under the stitching rail 49. The saddle is thereupon" raisedby the two earns 20 and21 on the cam discs 4 and 5 towards the stitching rail 49, whereby the fold ofthe sheetis forced exactly into the middle of the saddle (Figs. 1 to 4). In this position the preliminary puncturing needles 3O puncture the sheet vertically from'below, through the bar 27 with the rollers 28 and 29 beingmoved upwards by the cams 8. Thereupon the sewing and hooked needles 11 and 12 enter also vertically, but from above the-holes punctured by the preliminary puncturing needles, the bar 10 with the rollers 13 and l t being moveddownwards by the cams 7 to .the left and right. The thread laying member 32 thereupon moves to the left through the bar 31 with f lm roller being forced by the cam 35 to t 10 left, the thread which has been introduced into the sheet by the sewing needle 11 in a known manner being seized by the thread lay ing member 32, carried across to the hooked needle, caught by the latter, also 'in a known manner, and drawn up through the sheet. During this operation the thread is taken in and drawn tight by the thread tightening bar 38 in a known manner and at the correct moment is liberated by the thread gripping pin 41 and gripped again. The saddle there upon moves downward again. vertically andimmediately performs the outward swinging movement again for receiving a fresh sheet whereby the saddle, when swinging outwards changes its position in vertical direction upwards while the front half of the previously stitched sheet still lays on the saddle, the

saddle releasing afterwards the said half when it is in the outmost position. This half 7 is inclined in a certain degree (see Fig. 3) and will be pressed against the stock of stitched sheets by the saddle carrying a fresh sheet when it again moves inwardly. The said sheet together with the staple is pressed rearwardly for the thickness of a sheet, the sheet half projecting from the previously stitched sheet being firstly touched by the back wall of the rail 27 carrying the puncturing needles (see Fig. 10) and then 211301111- mediately by the back wall of the saddle plate Sti'and being thereupon pressed rearwardly.

It will be seen from the foregoing that in a saddle as described displacing of the sheet out of its folding center and al sothe pinching in of thread in the saddle are excluded, and that the sheets, before laying them upoirthe saddle, need no longer be opened out by hand and in spite of this rests correctly on the saddle. This is a remarkable advantage, since the worker can feed on fresh sheets at a con siderably greater rate and will therefore turn out more work. By the puncturing needles working vertically any displacement of the sheets during the puncturing operation is prevented and also any bending ofthe sewing and hooked needles, so that breakages due to this cause are practically excluded. The swinging motion of the saddle from a pivotal axis lying above it is also of great advantage,

as this enables the saddle to act at the same time as a pressing-on member for the sheets and it is therefore not necessary to provide special means for this purpose. A further advai'itage of the improved saddle consists therein, that the shaft located over the saddle not only is turnable but also vertically movable, so that the saddle brings the sheets not only under the needles, but simultaneously presses the same before thestitching operation into the fold.

What I claim is:

' l. A table-saddle for thread-bookstitching machines, including a single plate having a wedge shaped upper supporting edge of about 35 and provided with grooves for housing puncturing needles and with a sloping surface below the supporting edge on the side having the said grooves to lead away the thread loops outwardly to prevent pinching in of the thread loops, the said table-saddle being carried by swinging arms fixed to a horizontal shaft located over the saddle.

2. A table-saddle. for thread-bookstitching machines, including a single plate having a wedge shaped upper supporting edge of about 35 and provided with grooves for housing puncturing needles and with a sloping surface below the supporting edge on the side having the said grooves to lead away the thread loops outwardly to prevent pinching in of the thread loops, the said table-saddle being carried by swinging arms fixed to a horizontal shaft located over the saddle and vertically movable to obtain a vertical movement of the saddle for pressing the sheets in the folding center.

3. A table saddle for thread book stitching machines, including a single plate having a wedge shaped top edge of about 35 substantially uniformly pointed from both sides towards the top edge, both wedge faces being of sufficient width to spread open the sheet immediately beneath the fold, a hooked needle vertically movable and capable of piercing of the fold of the sheet without damaging the inner face of the sheet, the lower parts of which hang down in an angle less than 35, a

horizontally movablethreadlayer for the thread loop, and a sloping undercut surface on the working side of the thread layer below the supporting edge and extending from the working plane of the needle to the front wedge surface of the top edge to lead away the thread loop outside of the working plane of the needle forwards and upwards upon the said wedge surface to prevent pinching in of the thread loops.

4. A table saddle for thread book stitching machines, including a single plate having a wedge shaped top edge of about 35 substantially uniformly pointed from both sides towards the top edge, both wedge faces being r of sufficient width to spread open the sheet immediately beneath the fold, a hooked needle vertically movable and capable of piercing of the fold of the sheet without damaging the inner face of the sheet, the lower parts of which hang down in an angle less than 35, a horizontally movable thread layer for the thread loop, a sloping undercut surswinging arms carrying the saddle and fixed to the said shaft.

5. A tablesaddle for thread book stitching machines, including a single plate having a wedge shaped top edge of about 35 substantially uniformly pointed from both sides towards the top edge, both wedge faces being of sufficient width to spread open the sheet immediately beneath the fold, a hooked needle vertically movable and capable of piercing of the fold of the sheet Without damaging the inner face of the sheet, the lower parts of which hang down in an angle less than 35, a horizontally movable thread layer for the thread loop, a sloping undercut surface on the working side of the thread layer below the supporting edge and extending from the working. plane of the needle to the front wedge surfaceof the'top edge to lead away the thread loop outside of the working plane of the needle forwards and upwards upon the said wedge surfaceto'p'revent pinching in of the thread loops, a shaftlocated over the saddle and vertically movable, swinging arms carrying the saddle and fixed to the said shaft and cams provided on both sides of the machine frame to vertically move the said shaft without levers and connecting rods.

In testimony whereof I have aflixed my signature.

ULnIon BIsoHor. 

